The Padres have promoted left-handed pitcher Robbie Erlin from Triple-A Tucson and optioned right-hander Thad Weber back to the Pacific Coast League club.

The move came a day after Weber worked 4 1/3 scoreless innings in relief of Clayton Richard against the Brewers at Petco Park. Weber allowed two hits and a walk in his second short stint with the major league club this season.

In addition, infielder Logan Forsythe was transferred to the 60-day disabled list to open a spot on the 40-man roster for the 22-year-old Erlin, who is making his first trip to the major leagues.

Erlin was acquired along with right-handed starter Joe Wieland from Texas in the July 31, 2011 trade that sent right-handed reliever Mike Adams to the Rangers.

Erlin was 2-0 with Tucson with a 4.73 ERA in three starts. Over parts of five minor league seasons in the Rangers and Padres systems, Erlin is 20-10 with a 2.73 ERA with 57 walks and 378 strikeouts in 340 innings. Fifty-nine of his 74 minor league appearances have been as a starter.

He will join Anthony Bass as the second long man in the Padres bullpen and will be available Wednesday if starter Edinson Volquez needs early help the way Clayton Richard did on Tuesday.

It was the fact that Weber worked 4 1/3 scoreless innings in relief of Richard Tuesday night that resulted in Erlin getting the call. Bass had worked 3 1/3 innings the previous night in relief of Jason Marquis.

Forsythe will be eligible to return on May 22. He said Monday that he could be up to four weeks away from playing.

Meanwhile, the Padres will be seeking to end a five-game losing streak and avoid being swept in a three-game series for the fourth time this season in Wednesday night’s finale of a three-game set with the Brewers (7:05 p.m.).

Estrada, 29, has been with the Brewers since Milwaukee claimed him off waivers from the Washington Nationals in 2010. He was 5-7 last season with a 3.64 ERA in 29 starts after spending most of the 2010 and 2011 seasons in the Milwaukee bullpen. The Brewers are 3-1 in his four starts this season. Although rival hitters are batting .292 against Estrada, he has 25 strikeouts against only four walks in 24 innings.

Padres vs. Estrada

John Baker: 000 (0-for-1, SO)

Chris Denorfia: .500 (1-for-2)

Chase Headley: .500 (1-for-2, BB)

Will Venable: .000 (0-for-1)

Padres RHP Edinson Volquez (0-3, 8.84 ERA)

Volquez vs. the Brewers: 3-3 career, 5.64 ERA in 10 starts.

Volquez at Petco Park:

Volquez, 29, has given up five runs in the first inning of his four starts. The Brewers have scored six runs in the first innings of the first two games of the series. Volquez has yet to retire the side in order in the first inning. Volquez was 6-5 at Petco Park last season with a 2.95 ERA in 17 starts. In his first start at Petco Park this season, Volquez allowed seven runs (six earned) on six hits and three walks in just 3 1/3 innings.